Chusetts



(No Model.)

' WITNESSES:

u FETEKS, Howl-wha my, wmin m. o. c

H. M. VINOENTflv W. N. SMITH.

COMBINED DIE PLATE AND TA]? WRENCH.

I Patented Ma.1*.20,1883.

INVETOB:

ATTORNEYS.-

'UNITED STATES PATENT FFICE.

HERBERT M. VINCENT AND WILLARD N. SMITH, OF NEW BEDFORD, MASSA- CHUSETTS, ASSIGNORS TO THEMSELVES, JAMES H. GOFFIN, AND PRINCE H. ()OFFIN, ALL OF SAME PLACE.

COMBINED DlE -PLATE AND TAP-WRENCH.

SPECIFICATIQN forming part Of Letters Patent N0. 274,420, dated March 29, 18 83,

Application filed November I, 1882. (No model.)

To all whom it may concern Be it known that we, HERBERT M. VIN- CENT and WILLARD N. SMITH, of New Bedford, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Combined Die-Plates and Taprenches, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying [o drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of our improvement, shown as holdingthe dies and with part broken :5 away. Fig. 2 is aplan view ofthe same, shown with the dies removed and with part broken away. Fig. 3 is a sectional side elevation of a part of the same, taken through the broken linewar, Fig. 1. Fig. 4 is a sectional end elevation of the same, taken through the line 3 3 Fig. 1. Fig. 5 is a plan view of one of the sliding guards. Fig. 6 is an edge view of the same. a

The object of this invention is to promote convenience in cutting the threads of male and female screws.

The invention consists in a die-plate made with slots in its side edges to receive sliding guards, which engage with end grooves in the 0 dies, and which, as they are moved forward and back by the screw-handle, are made to move in and out to engage with and release the dies by stationary pins attached to the die-plate, and which pass through angular slots in the said guards. In the inner edge of the end of the die-plate is formed an angular recess, into which fits an angular projection formed upon the outer edge of the die, which projection has an angular recess in its apex,

so that the tool can be used for holding a tap without removing the dies, as will be hereinafter fully described.

A is the die plate or holder, which has a handle, B, formed upon one end, and a screwhole, (3, formed in its outer end to receive the screw 1). The outer end of the screw D is so formed as to serve as a second handle, E, and

its inner end is swiveled by an annular groove and a pin or other suitable means to the crosshead, F, which is fitted into the slot in the the guards H at thebottoms of the recesses L,

plate A that receives the dies G, so that the said dies will be pressed together by turning the screw-handle D E forward and loosened by turning back the said screw-handle. The dies G are made of a length equal to the width 5 5 of the slot in the plate A, so that they can be readily put in and taken out when the screwhandle D E is turned back. The end of the dies G have grooves formed in them to receive the inner edges of the slidingguards H, which serve as ways for the dies G to slide upon.

The guards H are inserted and slide in slots I, formed in the side edges of the die-plate A, where they'are kept in place by pins J passing through and secured in the slotted side bars of the said die-plate A. The pins J pass through angular slots K in the guards H. The rear parts of the slots K are parallel with the side edges of the die-plate A, and the forward parts of the said slots are inclined inward and forward, as shown in Figs. 1, 2, and 5. The inner edges of the guards H have recesses L formed in them to receive the ends of the cross-head F, so that the said guards H will be carried forward and back by the said 7 5 cross-head F as it is moved forward and back by turning the screw-handle D E.

To the ends of the cross-head F are attached pins M, which enter holes N in the edges of So so that the said guards H will be carried forward and back by the cross-head F when the said guards have been moved so far outward as to withdraw the recesses L from the ends of the said crosshead F. With this construction, when the cross-head l5 and the guards H are in the position shown in Fig. 2, the dies G can be readily inserted and removed. When thediesG have been inserted and the crosshead F is carried forward by turning the screwhandle D E, the said cross-head F carries the guards H forward with it, and the angular slots K and pins J cause the said guards, as they are carried forward, to move inward, so that their inner edges will enter the grooves in the ends of the dies G, so as to hold the said dies in place.

When the edges of the guards H have entered the grooves of the dies G the said guards move forward in straight lines to allow the mo (Ill said dies to be clamped between the forward end of the die-plate A and the cross-head F. The screw-handle E has a hole, 0, formed through it to receive a pin to serve as a lever, so ,that the screw can be turned to clamp and hold the dies Gr firmly. With this construction the dies G can be easily and quickly taken out and inserted.

In the inner edge of the forward end of the die-plate A is formed an angular recess, P, and upon the outer edge of the outer die, G, is formed an angular projection, Q, having an angular recess, R, in its apex, as shown in Fig. 1,.the recesses P R thus forming an angular socket to receive the shank of a tap, S, which will be held securely by forcing the die G against it by turning the screw-handle D E. With this construction the instrument can be used for cutting the thread of a male screw, and can then be used without removing the dies to hold a tap for cutting the thread of a nut or female screw.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. The combination, with the die-plate A,

having edge slots I, the dies G, having end grooves, and the screw-operated cross-head F,

. of the sliding guards H, having angular slots described, whereby the tool can be used for holding a tap without removing the dies, as set forth.

HERBERT M. .vrNoENT. WILLARD N. SMITH.

Witnesses:

H. R. PAULDING, DANL. T. DEVOLL. 

